Let-off for looms.



L. H.,LANDRY. LET-OPP POR. Looms. APPLIOATION FILED AUG. 18, 1909.

1,124,465, Patented .13.11.12, 1915.

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LODIS ILILANDRY, OF UXBRIDGE, MASSACHUSETTS, ASSIGNOR F ONE-EIGHTBI T0 'UDGli LAROCQUE, OF UX'BRIDGE, MASSACHUSETTS, AND ONE-EIGHTH T0 LOUIS BOUSQUET AND THEODQRE BOUSQUET, BQTH DE BURRILLVILLE, RHODE ISLAND.

LET-ors Foa Looms.-

Towallwhom it may concern Beitknown that L 'Lo'UIs H. LANDRY, a

citizen ofthe United States, residing at Uxbridge, in the 'county of Worcester, and State of Massachusetts, have invented a new anduseful Let-Olfffor Looms, of which the following is a specification.

,This invention relates to -a friction let-` o for looms.

The' principal objects of the .invention are to do away with the weights ordinarily employed for this purpose; to provide a construction which can be made in a small compactI 'way so' that'very little spac'e will be taken up; and toprovide for certain adjustments and for an adjustable yielding connection between the several elements of the mechanism;l also to provide a .construction in which the reduction in' sizeof the warp beam will tend to let-oli the tension, while ifdesired, the operator canl readily operate part of the mechanism by' hand for the purpose of increasing the tension.

Further objects and advantages of the invention will appear hereinafter. A Reference is to'be had to the accompanying drawinr in which the figure is an end elevation of one embodiment -of the let-olf motion showing enough parts of the warp beam to show how the invention is applied thereto.y

The drawingshows a part of the warp 10 on a warp beam which has a stud 11 and Afriction disk 12. y mounted a friction band 13 connected at one end with a stud 14 fixed on the end ofthe loom frame and having a free end 15 to which ispivotally connected a link 1 6 which is screw-threaded and has nuts 17 for holding in adjusted position a spur 18. This spur is adapted to fit in any one of a plurality of notches 19 on the short arm of a lever'20 which is pivoted on the frame. This lever preferably is located directly above the friction disk so that the short arm is substantially at right angles 'tothe direction of the link 16 which is tangent tothe circumference of the friction disk, and the long arm extends almost in a horizontal direction, but slightly'inclined, over'the frictin disk. This long -arm 'has a notch 21 into' which one end of aI lever 22p`rojects. The ot er end ofthis lever extends into a ir19,tch,2 v fon 'al third lever'24, The lever 24 On this friction disk is g Specification of Letters latent. i Pf-,xrtejnrbed Jan. 12, 193.5 i

application mea august is, 1909. seria No. 513,495. i

has a notch 25 at the other end for receivlng a spur 26. This spurv is provided with a ange 2.7 and is perforated so thatV a rod 28 can pass freely through it. This rod also passes through a notch or slot in the end of the' lever 24. `O11 this rod above themovable flange 27 is a liXed flange 29 and a.

which bears on the warp. The short arm 27v extends vfrom a point near `the pivot in an angular direction. Each of these levers 20 2 2, 24, 35 and 38 is shown as of that class of levers which have their fulcrum between the two'points at, and to which,the force is applied, but it will be understood that other forms of levers or other mechanism can be substituted therefor. With the form shown, or any other form embodying the saine principles, the mechanism can be located in a very small space and in a convenient location on the frame of the loom which supports the several pivots of the levers.

The operation is as follows :-The tension on the band 13 is applied throughthe leverage by the bearing of the warp on the roll 40 and when the warp beam decreases in size the roll 40 tends to moveto the left in the ligure which tends to bring the end of the short arm 37 down, which allows the spring 28 to force the upper arm of the lever 35 up. This release of tension of the spring will allow the left end of the lever 24 to move up, which allows the upper arm of the lever 22 to move down and the long arm of the lever 20 to move up. This permits the short arm of the lever 20 to move to the rightwhich obviously lessens the tension on the friction band. 0n the other hand, while the operator cannot use the handle 37 to reduce the tension, he can swing it to the left so as to swing the roll 40 away from the warp beam which will force the spring 28 down and l perform the oppositefunction to that just describedaso asv to increase the tension on the frlction disk. lIn case of emergency, however, the operator can turn the hand wheel'A 32 in either direction to increase or decrease the friction.

It will be obvious that various adjustments can be secured by means of the nuts `17 or by turning the hand wheel 32, thus practically adjusting the position of the nut 33.

While I have illustrated and described a preferred embodiment of the invention, I am aware that many modications can be made therein by any person skilled in the 4art without departing from the scope of the invention as eapressed in the claims. Therefore, Id not wish to be limited to all the Setails ofconstruction shown and described,

ut v v What I do claim is 1. In a device of the character described, the combination with a warp beam and a friction let-ofi1 therefor, of a lever adapted to bear on the warp on the war beam, said lever having a short arm fiXe thereto, an adjustable yielding connection, means connected with the short arm for applying pressure longitudinally to one end o ing connection, and means 4forconnecting the other end of said 'yielding connection with the friction let-off to apply the pressure therefrom tothe friction let-off and increase the tension on the warp beam'.

- 2. Ina device of the character described, the combination with a warpl beamand a friction let-off therefor, ofa lever ivoted near its center connected with the riction let-off, said lever having a notch, a rodlocated at an angle to saidv lever, a iange freely movable on said rod, said flange hav! ing a spur engaging in the notch on said lever, said rod having a second ilange fixed thereto and a screw-thread, a spring between said anges, a nut on the screw-thread having a notch, a lever engaging inthe notchon the nut, and means whereby the variations in the size of the outside diameters of the body of warp on' the warp-beam will cause the last named lever to'move so as to tend to compress said spring.

3. In a device of the character described, the combination of .a warp beam having a friction disk connected therewith, a friction band on the disk, a lever having a long arm and a short arm, said short arm bein located near the free end of said lfriction and and having a plurality of notches therein, a link on the free end of the friction band having aprojection adapted to engage in one of said notches, a spring connected with the lo'ng armofsaid lever, and a system of leverage connected with the spring and adapted to engage the war of the warp beam for letting off the friction as the warp beam-f decreases in size.

said yield-v 4. In a device ofthe character described,

the combination with -a warp beam having a friction disk thereon, of a friction band on thev disk, a lever located over the friction disk, said lever being connected with the loose end of the friction band, a lever pivoted above the rst named leverl and engaging it, a third lever-'adapted to be engaged at one end by the second lever, a resilient member connected with the other end of the 'third lever, a fourth lever havingone end engaging the resilient member,l`

and an operating lever vadapted to bear on the warp on the warp beam and connected with the other end of said fourth lever.

5. In a device of the' character described, the combination with a warp beam and a friction let-off therefor, of a lever pivoted near its center, a system of leverage connected with one end of said lever and with the friction letof,.the other end of said lever havinga notch, a rod located at an angle to said lever, a hollow flange freely movable on said rod and through which the 'rod.projects, said flange having a spur engaging in the notch on said lever, said rod having a second flange fixed thereto-and a screw-thread, a spring between said flanges,

a nut on the screw-thread having a notch,y

a `lever engaging in the notch on the nut,

and means whereby the variations in thel size of the outside diameters of the bodyr of warp on the warp beam will cause the last named lever to move so` as to tend to compress said spring.

6. In a device of the character described, the combination with a warpbeam and a friction llet-ofl` therefor, of a system of lev- Iorage connected with said friction let-olf,

short arm projecting therefrom betweenthe lever having a roll handle and roll and connected with the last v named lever, whereby motion of the -hand lever in one direction will increase the ten'- sion on the warp beam and in the other direction will decrease it.

7. In a device of the character described, the combination with a'warp beam and a. friction let-ofi' therefor, of a system of lev-' erage connected .with said friction let-ofi', a hand lever having a roll adapted tobear on the warp on the warp beam and having a handle by which the lever may be moved to swing the roll away frdm the warp beam, said lever having a short arm projecting therefrom between the handle and roll and connected with the friction let-off, wherebyD motion of the,v hand lever in one direction will increase the tension on the warp beam and in the other direction will decrease it.

8. In a device of the character described, the combination with a warp beam having a friction disk thereon, of a friction band on the disk, a lever having two arms located over the friction disk, one of said arms being connected with the loose end of the friction band, an operating lever adapted to bear on the Warp on the warp beam, a system of levers connected with the other arm of the first named lever and with said operating lever for transmitting motion' rod, a hollow fiange freely movable on said rod and through which the rod projects, said ange having a spur connected with said friction let-off, said rod having a second flange fixed thereto and a screw-thread beyond it, a spring between said flanges, a nut on the screw-thread having a notch, a lever engaging in the notch on the nut, a lever having aroll adapted to bear on the warp on the warp beam having an arm projecting therefrom between the handle and roll and connected with the last named lever, whereby motion of the hand lever in one direction will increase the tension on the warp beam and in the other direction will decrease it.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing witnesses.

ALBERT E. FAY, C. Fommsfr VVESSON. 

